Please use this identifier to cite or link to this item:
http://hdl.handle.net/10397/2516
DC Field | Value | Language |
---|---|---|
dc.contributor | Department of Applied Physics | - |
dc.creator | Xiang, R | - |
dc.creator | Lung, MT | - |
dc.creator | Lam, CH | - |
dc.date.accessioned | 2014-12-11T08:22:41Z | - |
dc.date.available | 2014-12-11T08:22:41Z | - |
dc.identifier.issn | 1539-3755 | - |
dc.identifier.uri | http://hdl.handle.net/10397/2516 | - |
dc.language.iso | en | en_US |
dc.publisher | American Physical Society | en_US |
dc.rights | © 2010 The American Physical Society. The Journal's web site is located at http://pre.aps.org/ | en_US |
dc.subject | Axisymmetric | en_US |
dc.subject | Critical radius | en_US |
dc.subject | Elastic strain energy | en_US |
dc.subject | Facetted surfaces | en_US |
dc.subject | Fast kinetics | en_US |
dc.subject | Heteroepitaxy | en_US |
dc.subject | Island formation | en_US |
dc.subject | Lateral expansion | en_US |
dc.subject | Layer-by-layers | en_US |
dc.subject | Nucleation energy | en_US |
dc.subject | Nucleation mechanism | en_US |
dc.subject | Quantum Dot | en_US |
dc.subject | Spontaneous formation | en_US |
dc.subject | Three-dimensional (3D) islands | en_US |
dc.subject | Total free energy | en_US |
dc.title | Layer-by-layer nucleation mechanism for quantum dot formation in strained heteroepitaxy | en_US |
dc.type | Journal/Magazine Article | en_US |
dc.identifier.spage | 1 | - |
dc.identifier.epage | 8 | - |
dc.identifier.volume | 82 | - |
dc.identifier.issue | 2 | - |
dc.identifier.doi | 10.1103/PhysRevE.82.021601 | - |
dcterms.abstract | We study the spontaneous formation of quantum dots in the form of three-dimensional (3D) islands on facetted surfaces in heteroepitaxy. Island development from fast kinetic Monte Carlo (KMC) simulations at low deposition rates is found to follow a layer-by-layer nucleation pathway characterized by energetics driven continuous lateral expansion interrupted by a sequence of independent two-dimensional (2D) upper-layer nucleation events. The process involves only unstable 2D upper-layer nuclei but no unstable 3D nucleus. We have calculated analytically the elastic strain energy of an island in the form of an axisymmetric stepped mound using a small-slope approximation. The total free energy of a system with a 3D island and an adatom bath is obtained. Our theory explains island formation via a free energy driven layer-by-layer nucleation mechanism. Upper-layer nucleation energy barrier, nucleation time, critical radius, and island step spacings are estimated. The relevance of entropic step-step repulsion is discussed. Our theory satisfactorily explains the 3D KMC simulations and may describe the initial evolution of islands in the form of stepped mounds observed in experiments. | - |
dcterms.accessRights | open access | en_US |
dcterms.bibliographicCitation | Physical review. E, Statistical, nonlinear, and soft matter physics, 2 Aug. 2010, v. 82, no. 2, 021601, p.1-8 | - |
dcterms.isPartOf | Physical review. E, Statistical, nonlinear, and soft matter physics | - |
dcterms.issued | 2010-08-02 | - |
dc.identifier.isi | WOS:000280487000003 | - |
dc.identifier.scopus | 2-s2.0-77955578767 | - |
dc.identifier.eissn | 1550-2376 | - |
dc.identifier.rosgroupid | r52965 | - |
dc.description.ros | 2010-2011 > Academic research: refereed > Publication in refereed journal | - |
dc.description.oa | Version of Record | en_US |
dc.identifier.FolderNumber | OA_IR/PIRA | en_US |
dc.description.pubStatus | Published | en_US |
Appears in Collections: | Journal/Magazine Article |
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